They will listen with both ears to what is said by the men just a step or two ahead of them, who stand nearest to them, and within arm's reach. A guide ceases to be of any use when he strides so far ahead as to be hidden by the curvature of the earth.

Let truth be a banner big enough to hide the man who holds it up.

A calculating engine is one of the most intricate forms of mechanism, a telegraph key one of the simplest. But compare their value.

Doubt is the beginning, not the end, of wisdom.

No gun is perfectly true. So the marksman, that he may hit the bull's-eye, points elsewhere.

Error held as truth has much the effect of truth. In politics and religion this fact upsets many confident predictions.

Ten builders rear an arch, each in turn lifting it higher; but it is the tenth man, who drops in the keystone, who hears our huzzas.